confused

My last AF was 12/9..I'm expected for next AF 1/11 according to this app....I got a very faint positive on 1/5. I went crazy and took a test everyday for a whole week and there it was BPF!!! I went to the doctor 1/11 and they confirmed it with a urine test-doctor said according to my last AF I'm currently 5 weeks. Doctor gave me a referral for an ultrasound. When I called to set up appointment they had an opening on 1/14 so I took it. When I went the tech basically doubted me that I was pregnant--she asked if I had cramps, if i was spotting and basically asked me if I was sure if I was pregnant because she said I don't see nothing and I will need to call my doctor for blood test. That broke my heart....Idk what to think am I still early??? I keep getting a positive pregnancy test. update: I also got the vaginal ultrasound